I find this remarkable. Well under 10% of my food comes from the commercial/restaurant sector. Today, I cooked venison, with potatoes (from a 5-pound bag), onions (3-pound bag), and other basic residential grocery ingredients. Yesterday, was similar, but with rabbit.
The last time I ate food from a restaurant or prepared commercial food was on vacation in January. No Starbucks or Dunkin coffee. No grocery store ready to eat meals. How can the average person afford so much restaurant food, even making allowances for restaurant waste? How can they tolerate it so often, when home cooking is (or would be with practice) so much better?
I think that you kinda answered your own question.
Many Millennials never had that much opportunity to learn how to cook at their momma's knee;
in my own instance, although not a millennial, I was specifically told to NOT come into the kitchen.
During holiday's when the extended family came together, there was the outdated division of labor : all the men in the living room with TV sports, and with all the women running the kitchen.
I think one of the best 'newly wed' presents for young couples is "The Joy of Cooking", although it is usually not found on the 'gift registry'.
There are instructions of how to economize by making various meals from cheap meat cuts, and offers variety and hacks in vegetable preparation and presentation.
With a good cook book, lacking instructions and recipes from the family cook, meals will never be boring; a good cook is a gem to behold, and greatly valued.